Holder for machine-tools.



E o. EVANS. HOLDER FOB MAJHIHE TOOLS.

, A?PLIUTIH FILED FEB. 10, 1908.

patented NW2, 1909.

is ff' wi /4 l SQ.

Y 'n Qgrwwg 0. EVANS, GSF PHILADELPHIA, PENNSYLVANIA.

HOLDER FR MACHNE-TGOLS.

Specification of Letters atent.

latented Nov. 2, 1909.

Application filed February 10, 3.908. Serial No. 5,015.

To all 'zo/rom -i vnary concern.'

le it known that. l, tiranni* O. Evans, a citizen o'l the United States, residing in the city and county of Philadelphia, State ot' Al"ennsylvania, have invented a .new and use- Vl'nl Holder for ltlacliine-lfools, ot which the l'ollowing` is a speoitication.

'lhe obj ectoli my invention is to provide a holder toitaps or like tools, which will clamp the tool securely and hold the same Iirmly regardless of the strain the tool may be subjected to during a-tapping or drilling operation. f

Another object- Aof my inventiony is to provide clamping jaws carrying a lock member' 'tor preventing rotation of 'the tool relative to the jaivs all so assembled as to avoid the use ol" set screws or deviceslof like char- Hotel'.

lt further consists of other novel details ot' construction, all as Will be hereinafter set forth.

Figure l represents a sectional elevation ot a holder embodying` my invention. Fig. 2 represents a detailed view ot the clamping head. Fig. 3 represents a 'bottoni view ot' the clamping' head showing the jaws in operative position. Fig. el represents a. perspective view of one of the clamping jaws. Fig. 5 represents a sectional elevation ot' the clamping head.

Si mlar numerals ot reference indicate corresponding parts in the ligures.

Heter-ring to the drawings, l designates a. portion ot' the traine ot' a machine which carries or to which is secured the head 2 adepted to term bearing for the hub E, carrying, a t a suitable point, a driving il. This hub 3 is held in position and from vertical movement by any suitable means, but` preterablv as shown by a collar i3, located in a slot o in the head 2, a locking pin 8 enga-ging the hub and collar to hold the same in suitable relation, by which it will be clearly seen that the hub 3 may be rotated, While any longitudinal or vertical movement thereof is prevented by the aid pin S.

0n one end et the head 2, a. leader nut 'l' provided with ears 9 lwhich abut the head 2 and the portion ll of said nut 'Y internally threaded at l() to engage a like thread on a leader lil. 'The leader nut is suitably held in place, as shown, by means olf a clip l2 secured to the head 2 by bolt 13. The ears 9 on the leader'nut T are provided to adjust beingmade by loosening the bolt 13 and ringing the clip to one side 'when the leader nut may be turned by a wrench or other suitable means engaging the ears 9.

The leader le tits on aneck l5 of a spindle lo and is held thereon in any desired manner, as by the nut 17. This spindle 16 has a bore i8 running` through a portion ot its length and has for the ren'iainder of its length, a. counter-bore i9 and terminates in a head 2() for the reception of the olai'tipingv jaws 2l and 22. The head 20 has a suitably shaped slotl 23 therein which communicates with an enlarged space :24 in the base 'of the head 20 While the end walls of the .slot 23 are beveled, as shown atand 26, to torni a bearing surface for the corresponding beveled sides of the clamping jaws 2l and The enlarged space 2-l allows the jaws to be pushed back and released from wedging action, when either or both may be removed from the head.

is Wedge or keystone shaped and acts as a guide to aid in the clampinglaction of the jaws, which are correspondingly cut away, as shown atl 2S to tit this wedge projection 27. Both jaws 2l and 22 have a threaded bore 29, to provide an opening for the re-' pa. ig through the bore lll and .securedto the spindle i6 between the collars 3i' and 38.

head vis formed on the end of this rod 36 in order that it. may be rotated to change the adjustment ot the tube 33, which adjustnient is allowed for by a slot 44 in the tube 53. pin il-0 passes through this slot 44 and engages the spindle i6, in order to rotate the tube with 'the other parte.

lt will be apparent, when a tool, as the .ap is placed in the jaws 2i and 22 and the key 3l properly seated therein, that any down-Ward pressure of the tube 33 on the vmembers forming the jaws Will cause them through the Wedge-like action to grip the tool and hold it :tast and as long as the tube rests on the jaw members 21 and 22, they i re securely locked against movement and the travel of the leader le, the adjustment j the tool cannot become loose or be removed.

The sides of this slot `23 j have a. projection 2T, formed thereon, which tive in its-action and in the drawings I have The tool or tap may' be removed from thc jaws by engaging the nut 38 on the spindle 36 and rotating the said. spindle to raise the tube 33 from engagement with the jaws 21 and 22. This action frees the jaws from a downward' pressure and if they are now pressed upward into the enlarged space 24, the tool may be 4relieved from gripping action and removed from the holder.

From the above it will be understood that my device is simple in construction and posishown one form which will operate successfully in practice although the arrangement of the parts'may be varied and other instru.- mentahties may be employed which will come within the scope of .my invention, and I do not therefore desire to be limited to the-A exact construction as herein shown and described. I

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:-

l. In a tool holder, a head having a slot l and an enlarged space communicating therewith, the end walls of the slot being beveled, jaws therein having correspondingly beveled surfaces and coinciding tapered recesses, the

sides of said slot hai/'ing wedge-shaped -projections engaging said recesses, one of said jaws having a recesscommunicating with the bore thereof, and a key itted therein, combined' with a sleeve bearing against the inner face of the jaws to exert outward pressure thereon.

2. In a tool holder, a head having a slot and an enlarged space communicating therewith, the end walls of the slot being beveled, jaws therein having correspondingly beveled surfaces and coinciding tapered recesses, the sides of said slot having wei'lge-shaped projections engaging said recesses, one of said jaws having a recess communicating with the bore thei'eoi, and a key fitted therein, combined with a sleeve bearing against the inner Jface of the jaws to exert outward pressure thereon, a tubular spindle surrounding said sleeve and secured to said head, and means passed'through the Vspindle and engaging the sleeve for moving it endwise to relieve its pressure against the jaws.

HENRY O. EVANS.

Witnesses ROBERT M. BARR, (l, D. MeV/ii. 

